Fungicide resistance in Cercospora species causing cercospora leaf blight and purple seed stain of soybean in Argentina
Cercospora species cause cercospora leaf blight (CLB) and purple seed stain (PSS) on soybean. Because there are few resistant soybean varieties available, CLB/PSS management relies heavily upon fungicide applications. Sensitivity of 62 Argentinian Cercospora isolates to demethylation inhibitor (DMI)...
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2020sautua1.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Fungicide resistance in Cercospora species causing cercospora leaf blight and purple seed stain of soybean in Argentina |
| 520 | |a Cercospora species cause cercospora leaf blight (CLB) and purple seed stain (PSS) on soybean. Because there are few resistant soybean varieties available, CLB/PSS management relies heavily upon fungicide applications. Sensitivity of 62 Argentinian Cercospora isolates to demethylation inhibitor (DMI), methyl benzimidazole carbamate (MBC), quinone outside inhibitor (QoI), succinate dehydrogenase inhibitor (SDHI) fungicides, and mancozeb was determined in this study. All isolates were sensitive to difenoconazole, epoxiconazole, prothioconazole, tebuconazole, and cyproconazole (EC50 values ranged from 0.006 to 2.4 μg/ml). In contrast, 51% of the tested isolates were sensitive (EC50 values ranged from 0.003 to 0.2 μg/ml), and 49% were highly resistant (EC50 mayor a 100 μg/ml) to carbendazim. Interestingly, all isolates were completely resistant to azoxystrobin, trifloxystrobin, and pyraclostrobin, and insensitive to boscalid, fluxapyroxad, and pydiflumetofen (EC50 mayor a 100 μg/ml). The G143A mutation was detected in 82% (53) of the QoI-resistant isolates and the E198A mutation in 97% (31) of the carbendazim-resistant isolates. No apparent resistance mutations were detected in the succinate dehydrogenase genes (subunits sdhB, sdhC, and sdhD). Mancozeb completely inhibited mycelial growth of the isolates evaluated at a concentration of 100 μg/ml. All Argentinian Cercospora isolates were sensitive to the DMI fungicides tested, but we report for the first time resistance to QoI and MBC fungicides. Mechanism(s) other than fungicide target-site modification may be responsible for resistance of Cercospora to QoI and MBC fungicides. Moreover, based on our results and on the recent introduction of SDHI fungicides on soybean in Argentina, Cercospora species causing CLB/PSS are insensitive (naturally resistant) to SDHI fungicides. Insensitivity must be confirmed under field conditions. | ||
| 650 | |2 Agrovoc |9 26 | ||
| 653 | |a CERCOSPORA SPP | ||
| 653 | |a DMI | ||
| 653 | |a E198A | ||
| 653 | |a G143A | ||
| 653 | |a QOI | ||
| 653 | |a SDHI | ||
| 700 | 1 | |a Sautua, Francisco José |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal. Cátedra de Fitopatología. Buenos Aires, Argentina. |9 22833 | |
| 700 | 1 | |a Doyle, Vinson P. |u LSU AgCenter. Department of Plant Pathology and Crop Physiology. Baton Rouge, LA, USA. |9 69548 | |
| 700 | 1 | |a Price, Paul P. |u AgCenter. Macon Ridge Research Station. Winnsboro, LA, USA. |9 69550 | |
| 700 | 1 | |a Porfiri, Alejandro |9 73479 | |
| 700 | 1 | |a Fernández, Paula |u CONICET. Buenos Aires, Argentina. |u Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Agrobiotecnología y Biología Molecular (IABIMO). Hurlingham, Buenos Aires, Argentina. |9 60855 | |
| 700 | 1 | |9 32186 |a Scandiani, María Mercedes |u Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Centro de Referencia de Micología (CEREMIC). Rosario, Santa Fe, Argentina. | |
| 700 | 1 | |a Carmona, Marcelo Aníbal |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal. Cátedra de Fitopatología. Buenos Aires, Argentina. |9 3109 | |
| 773 | 0 | |t Plant pathology |g Vol.69, no.9 (2020), p.1678–1694, tbls., grafs. |w SECS000416 | |
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| 856 | |u https://www.wiley.com/ |z LINK AL EDITOR | ||
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